Improvement in running-stitch sewing-machines



2'Sheets--Shet 1'.

. s. HAHN. Running-Mitch Sawing-amines. No.-157,598. Patentgd 960.8,1874.

THE GRAPHIC CD. PHOT-OUTHBQRH PARK PLACEINX.

U ITED STATES PATENT Orrron- SAMUEL HAHN, or VIENNA, AUSTRIA.

IMPROVEMENT IN RUNNING-STITCH SEWING-MACHINES.

Specification forming part of Letters Patent No. 157,598, dated Decembei 8, 187 4; application filed September 19, 1874.

the following is a specification:

The object of my invent-ion is an improved running-stitch sewing-machine, in which the length of the stitch may be readily changed, and by which one, two, or more seams may be sewed simultaneously at any desired distance from the edge of the fabric, the parts of the machine being arranged, as fully described hereafter, so that the needle or needles need be bent but slightly, thereby preventing the excessive friction resulting in ordinary machines of this class from the use of needles with abrupt bends.

Figures 1,2, and 3, Sheetl, of the accompanying drawings represent the machine in its simplest form, Fig. 1 being a front View, Fig. 2 a side elevation, and Fig. 3 aplan view, partly in section.

G is a frame, which may be secured to a table by a set-screw or otherwise. W is a shaft, to which motion may be imparted either by hand or by a. treadle or other driver. Z is a vertical rod, fixed in proper position in the frame by a setscrew, and carrying on its top the spool with the thread. The lower end of this rod has bearings for two or more small toothed wheels, r and 1", which gear into corresponding wheels 1 and 0, arranged diagonally in relation to the upper wheels, and having their bearings in the lower part of the frame G. The Wh6611 is attached to the shaft W, or it may be a part of the shaft.

By reference to Fig. 5, showing these wheels on an enlarged scale, it will be seen that. on turning the wheel r the other wheels will revolve in such a manner that the material to be worked will readily run between the two sets of wheels when introduced fromthe workplate. (Shown in Figs. 1 and 3.)

The wheels I prefer to construct with from five to ten teeth, but more may be used, and these teeth are rounded at their edges, as shown in Fig. 2. A groove is turned in the middle of the teeth of all the wheels, and these grooves, being all in one vertical plane, form a curved channel for the reception of a needle, Fig. 3, bent to conform to the shape of this channel. The point of the needle should project slightly from between the teeth.

of the wheels r 'and r toward the work-plate, and the eye is by preference in a vertical position. The needle can be introduced between the wheels by lifting the rod Z, placing the needle in the aforesaid channel, lowering the rod until the two sets of wheels are properly in gearthe rod being finally secured by the setscrew--an'd the thread passed through the eye of the needle, when the machine is in working order. The fabric to be sewed is now placed on the work'plate and introduced be tween the teeth of the wheels r and W, the latter forming creases, which are pushed onto the point of the needle and along the same, and also along the thread for a considerable distance, the left hand of the operator being used to assist the material in its course on the thread, and to properly stretch it out: as much as may be desired. \Vhile the fabric is being pushed onto the needle, andalong the same, the latter is retained in its place between the wheels in consequence of its bent shape, which prevents it from beingpushed from the abovementioned channel formed by the grooves of the wheels. Of course, so much playbetween the teeth of the wheels must beallowed as the thickness of the fabric demands. ()wing to the diagonal arrangement of the wheels the needle will retain its position when bent to a very slight extent, and this bend, as will be seen by reference to Fig. 5, conforms to the course the fabric would take in passing between the wheels, if the needle were not in its position. The fabric, therefore, passes to the thread without any abrupt changes in the direction of its motion, and, consequently, without undue friction. The plates (1 d, in which the journals of the upper wheels turn, are detachable, the journals of the wheel 0' fit open bearings, and the shaft W may be readily withdrawn after loosening the screwt, so that all the wheels may be readily removed and replaced by others having more or less teeth, when the size of the stitch is to be changed. By securing the upper wheels to a pendent bar, ample space is left on all sides of the wheels for the fabric, so that the seams may be sewed at any desired distance from the edge.

g leases Two modifications of my machine are represented in Figs. 7 and 8, Sheet 2. Fig. 7 shows the shaft W fitted with a spur-wheel, V, larger in diameter than the above-described wheels, which wheel V gears into the upper wheels r and r of the series shown in Figs. 5 and 6, greater speed of working being attained by the additional driving-wheel. In this case I prefer to let the upper wheels r and 1' run in bearings fixed in the frame, while the rod Z, carrying the lower Wheels, r and W, is adapted to the lower part of the frame.

The second modification consists in making the wheels r r 1' and 1' of such a breadth that two or more needles may be employed at the same time. This arrangement is shown in Fig. 8. The wheels have grooves turned across their teeth at the required distance apart, for the admission of the required number of needles. I prefer to attach to the bearin g-frameof the upper wheels two guide-rods, z and 2 each to be secured by a set-screw, and a rod, 2 for the greater convenience of liftin g and lowering.

This modification is of special value for sewing at one time a number of plaits,sucl1, for instance, as those in a shirt-front.

The application of auxiliary attachments, such as guides, hemmers, &c., may be the same with this machine as with other sewingmachines.

It will be evident that six, or even more, of the grooved cog-wheels may be used.

I claim as my invention 1. The combination, in a running-stitch sewing-machine, of four or more toothed and grooved wheels or rollers, arranged diagonally, and one or more bent needles, arranged as shown and described, in the grooves of the rollers, for the purpose set forth.

2. The combination,in a running-stitch machine, of the bent needle or needles, and the upper and lower wheels or rollers, all detachable from their bearings, as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SAMUEL HAHN.

Witnesses:

L. BRENTANO, J. E. MARSH.. 

